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i <br />WATER DMSION 2 <br />OFFICE OF THE SPATE ENGINEER <br />310 Fast Ahnendo Ave.. Suite B <br />Pueblo. CO B100i <br />Phone 17191542 3.'i68 <br />FAx 1]191544-0800 <br />Mr. Larry Oehler <br />Division of Minerals and Geology <br />1313 Sherman St., Rm. 215 <br />Denver, CO. 80203 <br />July 31, 2001 <br />When replying, please refer to: <br />Trout Creek Dam <br />Water Division 2, DAMID:110234 <br />Dear Mr. Oehler: <br />OF=ep[p <br />N 1 <br />I,- ~ <br />~' <br />.i~~~, <br />i eiE'~~ <br />Governor <br />Greg Watcher <br />E~exuWe Dim:lor <br />Hal Simpson <br />State Englnea <br />Steven J. Witte. P.E. <br />Dnision Engi,uer <br />At your request, I reviewed a blasting plan for proposed rock quarry located <br />approximately 150 feet southeast of the recently completed Trout Creek Dam. After <br />reviewing the technical data supplied by ACA Products and a report prepared by <br />Revey Associates, Inc., it appears that the blasting will have minimal effect on the <br />Roller Compacted Concrete (RCC) dam. In that both the dam and the proposed rock <br />quarry are owned by the same person, Mr. Paul Moltz, and the fact that by state <br />statute the safety of the dam is the responsibility of the owner, I have no objection to <br />the blasting as it is currently being proposed. I would encourage the owner to perform <br />some careful monitoring of the dam in addition to the seismographic recorders which <br />have been proposed. It is my recommendation that the following monitoring be <br />performed after each blast is executed in the proposed quarry. <br />The piezometers should be read before and after each blast and recorded <br />along with the current reservoir water surface elevation. A sudden <br />increase in the water level elevation in either piezometer could indicate a <br />significant problem. <br />All of the current seepage through the RCC lift joints and around the rock <br />abutments should be collected, measured and recorded. A sudden <br />increase in the seepage flow could indicate a significant problem. <br />3. A careful visual inspection should be performed to look for signs of <br />cracking or distress in the RCC and adjoining rock abutments. <br />Thank you for the opportunity to review the blasting plan and supplied technical data <br />and if you have any questions, please contact me. <br />Sincerely, <br />